Improvement in belt-shifters



UNITED STATES PATENT CHARLES H. HILL AND AMOS W. PROGTOR, OF BILLERIGA,MASSACHU- SETTS, ASSIGNORS TO UNI ONSTONE COMPANY.

IMPROVEMENT lN BELT-SHIFTERS.

Specification forming part of Letters Patent No. 158,173, datedDecember29, 1874; application filed November 13, 1874.

GAsE B.

To all whom it may concern:

Be it known that We, CHARLES H. HILL and Arms W. Pnooron, of Billerica,in the State of Massachusetts, have invented an Improvement inBelt-Shifters, of which the following is a specification:

The invention has reference to that class of machinery in which there isemployed a carriage or slide having a reciprocating motion; and consistsin a contrivance by which the belt-guide, when thrown over to shift thebelt from one position to another, is held locked in its extremeposition.

We have applied the invention to the carriage of a knife-grindingmachine, of which we proceed to give such a description as will enableothers to fully understand our presentinvention and its mode ofoperation.

Figure 1 is a plan of a said knife-grinding machine. Fig. 2 is a frontelevation of the same, a part taken on the line y y of Fig. 1 being insection. Fig. 3 is a side elevation, a part taken on the line or w ofFig. 1 being in section. Fig 4 is a view in detail of the beltshiftingdevice.

A is the standard or pedestal of the machine. B is the grinding-wheel,fixed. upon the m ain shaft a, which is revolved by a crank,

b, or by power. The main shaft a has adjustable bearings, which it isnot necessary to describe otherwise than to say that they are supportedby brackets O 0 upon the pedestal A. At the other extremities of thesame brackets are ways J J, upon which the carriage I is supported andtravels. The carriage I carries the knife-bar D, and by its movementsforward and back presents the knife in grinding throughout its length tothe wheel. Various screws and levers are showniiu the drawings fordetermining the bevel to be given to the. knife, which will not be heredescribed, this invention having reference only to the movement of thecarriage.

The carriage operates as follows: a a are two brackets attached to thepedestal, as sl 0W1, and furnishing beariu gs for a shaft, 11 upon whichare two bevel-gears, c d, the bevel-gear 0 running loose upon the shaftb while the bevel-gear d is fixed upon and revolves with the shaft. Atone end of the shaft 12 are three large pulleys, e f g, the pulley 0being fast, f being an ordinary loose pulley, and g being a loosepulley, but having its hub rigidly connected with the hub of thebevelgear 0 h is a pulley upon the main shaft. It is connected with oneof the pulleys c, f, or g, as the case may be, by the belt 71. 76' is abevel-gear, made fast to the shaft Z, passing through and havingbearings in the standard. It carries at its other end a small pinion, m,taking into the large pinion K, to operate the rack L attached to thecarriage, as shown. The bevel-gear 7c meshes with the bevel-gears cl andd.

It is obvious that when the belt i connects the pulley h in motion uponthe main shaft with the fast pulley e, the shaft 12 is revolved and withit the bevel-gear d turning the bevelgear 7c in one direction, and thatwhen the belt is shifted to the pulley g, loose upon the shaft b thebevel-gear 0 also loose upon the shaft b but fast to the pulley y, willturn the bevel-gear k in the opposite direction. It follows that whenthe bevel'gear 7c is turned in one direction the carriage will go to theright, and when in the other to the left.

The motion of the carriage is reversed as' follows: 1? is thebelt-guide, the belt r passing through a slot,.t. The belt-guide ispivoted at u to a cross-bar between the two ways J J, and has two shortarms, in which are two adjustable pins, 12 o, as shown. M is a. slidingbar secured to one of the ways J by two setscrews, w w, two slots, 2 z,in the bar, perinitting it to have a motion to the right or left for thelength of the slots. a is an arm projecting upward from the sliding barM, and b is a cam projecting inwardly from the sliding bar, and shapedas shown, so that as the baris moved one way or the other the camstrikes one of the adjustable pins '0 c, and swings the belt-guide P,and holds it locked until designedly released. The arms in which thepins 11 v are inserted may be so shaped as not to require the pin.

In the carriageis a series of holes (shown in plan in Fig. 1 and insection in Fig. 2) and 0 c are two pins, Which are dropped into theseholes, and which are long enough to strike the arm a as the carriagepasses over the arm. The carriage moving, say, from left to right, oneof the pins 0 strikes the arm a and carries with it the bar M a distanceequal to the length of the slots 2 z, and this causes the cam b to swingthe belt-guide P, thereby shifting the belt 41 from the pulley e to g,and, as before described, reversing the motion of the carriage. Themovement of the" carriage is now to the left until the other pin 0strikes the arm a when the motion is reversed, as before.

The sliding bar M is shown with a handle,

CHAS. H. HILL. A. W. PBOGTOR. Witnesses:

OHAs. F. ABBOTT, G. H. STINCHFIELD.

